[PATCH] [X86][AVX] Fix wrong lowering of VPERM2X128 nodes.

[Michael Kuperstein]

I still think it'd be best to add an explicit check for both elements being SM_SentinelUndef.
I'd really hate to be the guy who has to hunt down bugs caused by changing the value of SM_SentinelUndef to be, say, INT_MIN instead of -1. :-)


http://reviews.llvm.org/D8119

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